﻿/*
Copyright 2010 Andy Uhl

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/*
Original code taken from Paul Welter at:

	http://weblogs.asp.net/pwelter34/archive/2006/05/03/444961.aspx

Thanks to Paul for putting this code out there. 
*/
using System;
using System.Collections.Generic;
using System.Text;
using System.Xml.Serialization;
using System.Runtime.Serialization;

namespace ListMaker.App
{
	[XmlRoot("dictionary")]
	[Serializable]
	public class SerializableDictionary<TKey, TValue> : Dictionary<TKey, TValue>, IXmlSerializable
	{
		public System.Xml.Schema.XmlSchema GetSchema()
		{
			return null;
		}

		public void ReadXml(System.Xml.XmlReader reader)
		{
			XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
			XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue));

			bool wasEmpty = reader.IsEmptyElement;
			reader.Read();

			if (wasEmpty)
			{
				return;
			}

			while (reader.NodeType != System.Xml.XmlNodeType.EndElement)
			{
				reader.ReadStartElement("item");

				reader.ReadStartElement("key");
				TKey key = (TKey)keySerializer.Deserialize(reader);
				reader.ReadEndElement();

				reader.ReadStartElement("value");
				TValue value = (TValue)valueSerializer.Deserialize(reader);
				reader.ReadEndElement();

				this.Add(key, value);

				reader.ReadEndElement();
				reader.MoveToContent();
			}

			reader.ReadEndElement();
		}

		public void WriteXml(System.Xml.XmlWriter writer)
		{
			XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
			XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue));

			foreach (TKey key in this.Keys)
			{
				writer.WriteStartElement("item");

				writer.WriteStartElement("key");
				keySerializer.Serialize(writer, key);
				writer.WriteEndElement();

				writer.WriteStartElement("value");
				TValue value = this[key];
				valueSerializer.Serialize(writer, value);
				writer.WriteEndElement();

				writer.WriteEndElement();
			}
		}
	}
}
